TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4182 SUBJECT: GRB051028:MASTER correction and final results DATE: 05/10/30 15:53:30 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, V.Kornilov, D.Kuvshinov, N.Tyurina, A.Belinski, E.Gorbovskoy, A.Krylov, G.Borisov, A.Sankovich, G. Antipov, V.Vladimirov Sternberg Astronomical Institute, Moscow Union 'Optic' MASTER robotic system (http://observ.pereplet.ru) responded to HETE GRB051028 (GCN 4172) at very nice Moscow weather. Unfortunately, the remoute observations was delayted due to manage computer problems. Now we find new earlier images. First image was at 2005-10-28 16:23:14 (not at 16:59:56 UT as we noted in GCN4171, GCN4173) i.e. 2h 46min after GRB time. The unfiltered image is calibrated relative to USNO A2.0 (0.8 R + 0.2 B). Final results: the uper limits on OT (M. Jelinek et al. GCN4175) are UT (start) T-T_GRB TotExpTime 3sigma limit 16:23:14 02h 46 m 45 s 17.9 16:59:56 03h 23 m 45 s 17.5 17:32:40 04h 12 m 360 s 18.3 20:01:04 06h 41 m 1050 s 19.6 21:46:43 08h 26 m 1200 s 19.4 This work is supported by RFFI 04-02-16411 grant. This message can be cited. Mailto: lipunov@sai.msu.ru